Re: Turbo Stockers
 

I am not a turbo dodge or ford expert, but I do tune a lot of turbo cars. Wideband afr gauge is the most important tool for me. I haven't used or even seen a egt gauge in a turbo car in years. Knowing the AFR, especially on a wideband, is a lot more acurate way of tuning. You will pick up dangerous AFRs before you see the dangerous EGTs. Like I said I'm not a turbo dodge or ford guy, and certianly some of these guys have it figured out, just sharing my experiences.

Re: Turbo Stockers
 

My best runs were at just below 1800 degrees at the finish line, with the probe about 1 inch from the head.
I just adjusted the fuel pressure to get the egt number I wanted

Re: Turbo Stockers
 

I assume that lowering the fuel pressure lowers the egt? and vice versa

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Nope just the opposite. Bring the fuel down it raises EGT's. Put more fuel in it lowers them.

Re: Turbo Stockers
 

Bringing this one back up because it's time for a new turbo.

So, what exactly does the turbo rule mean? The housing can be 2mm bigger than the max allowed turbocharger size? What size? The wheel OD? Where is that size published? No mention of the wheel size, so I assume it has to be the max allowed size - whatever that is.

All of my turbos are used and slightly worn, but I honestly don't know what the stock size is supposed to be. It would be nice to know exactly how much these turbine wheels are worn down. And, whether or not I should invest in a new one.

Art - do you have the stock specs for the Mitsubishi turbo used on the TD's?

Re: Turbo Stockers
 

I wouldnt be real concerned with it. You know you have a stock turbo. Just get the correct rebuild parts. As far as that dia of the inlet.. It says Turbocharger size will be verified by measuring the housing bore at the leading edge of the impeller wheel. So basically measuring the dia. of the inlet right at the front of the compressor wheel. If you are not aloud to change the wheel I dont see much need play with the inlest size.. Not 2mm anyway. Every little bit helps I suppose. But I would think that you would want the tolerance to be tight right at the wheel...

Re: Turbo Stockers
 

I always just bought new or good shape used Mitsu's. Never had them check the same things twice. Some of the way they measured was laughable.
I gave them a stock turbo to keep and I think they threw in the trash before they left the track.
With the exhaust system I had I could make 18 pounds or so (in great air)
That was enough 1800 degrees at the finish line.

Re: Turbo Stockers
 

Just saw this post raising fuel lowers EGT lowering it raises EGT.

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I'm not to worried about the compressor side. It's the turbine I'm worried about. I have a good turbine housing, but all of my turbines measure at least 0.04 smaller than the housing at the exducer. I think maybe my turbines are worn down pretty far. My guess is it should only have 0.01" clearance, but I don't know for sure what the turbine is supposed to be. I found some specs that say it should be 1.88" - mine measure more like 1.84". Ouch! But, again, the housing bore measures close to 1.88" So, I don't know if that spec is for the housing or the turbine.

You definitely do NOT want 2mm clearance around the compressor. It will cause a very slow boost rise. You want as small a clearance as you can run on the compressor side.

Related question - Art, did you have trouble seizing the wastegate arms? I seem to seize one up every single season. The 'good' turbine housing I mentioned above I shelved because it seized the WG arm. I took it apart and reamed it out, but I'm concerned it will just seize up again. I reamed it with a 5/16" drill (the arm measured 8mm, so there's alot of clearance now). Just gotta get the arm welded back up and put my 'good' turbine in there for Indy...

Re: Turbo Stockers
 

It happened to me a few times especially when the car sat for a couple of months. I would just free it up. Then put it back together.
It happened when I sold the car to Jim. Took it to Cecil County Went to the line, The car left like a garbage truck. I knew what the problem was but the look on Jims face was priceless I knew he was thinking what did I come up here for? Loosened it up, ran the expected number. And the car was on it's way to Fla.

If I were you I'd look for some heat resistant preoiled bushing And install that.
It seems to be the leaded gas that does it Jimmy Malone hasn't had it happen to him that I know of and he uses the VP unleaded.

Re: Turbo Stockers
 

I suspected the leaded fuel might have something to do with it.

How did you free them up?

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And what would be the reason for having movement in the waste gate arm?
Is that what they call "bracket mode" ?

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Well, yeah. If the arm doesn't move, the boost is uncontrolled. I've gone fast that way, but consistency is non-existent.

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We delay the waste gate opening but not stop it. With the waste gate closed you melt the motor, but go fast.
Bracket mode would be lowering the total boost. Or running it rich. I've done both sucessfully
Bracket mode on my N/A car is just shift it 1000 rpms early.

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With a hammer (chevy tool).

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Just ditch it and run an external wastegate ha.

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The legality of that seems a little gray to me, so I think I'll stay away from them until it's more black and white.

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I suppose all of this applies to FWD cars where traction is a problem.
You won't melt stuff if you retard the timing appropriately.
Why not use an MSD Boost control?

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Mark I can show you 20 turbo dodges with stock type ECU's that slowed up a bunch with the MSD unit.
If you retard timing you actually raise EGT I know it doesn't make sense. But I've been there done that.

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Unplug the knock sensor it will be more consistant.or the ecu will hear noise and retard the timing a bunch.would love to check out a 2.3 turbo stocker.

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I would like to sale my 88 turbo coupe I/FI now R or Q/S car .To many cars at my house . Do you run a fan under the stock intercooler to pull air down thru the hood? This also adds cooling before and after your runs . What tire and size is on your car ? 140/150water temp going into the burnout box is what you want , higher temps will slow you down , as well as hot lapping a t-bird .What injector is in there now .

Re: Turbo Stockers
 

The 1035 is a very good gasket but there is a chance you might
hurt the head before it lets go.Alot of us 2.3T guys(not class racers)
use the 8993 until you feel like you have the combo close to dialed in.
The 8993 is a decent hg and it will let go before you hurt anything else.
Lots of guys flying using the 8993.
Found this out after doing the knock sensor delete and getting a bad
load of fuel.

Dont forget the BCS that limits boost in low gear if you car still has
it .

I have been 12s with my 2.3T bracket car and it is currently getting
a race header,T64 turbo and converting to carb/blowthru trying to
go 10.90s.Weight reduction and some chassis work should also help.

Re: Turbo Stockers
 

Ken,

I would like to talk to you about the '88 you have. please e-mail me @ icemank911@earthlink.net

thanks in advance